Caitanya-caritāmṛta 15.17
kṛṣṇa-janma-yātrā-dine nanda-mahotsava gopa-veśa hailā prabhu lañā bhakta saba
[krishna-janma-yaatraa-dine nanda-mahotsava gopa-vesha hailaa prabhu lanaa bhakta saba]
Blended reading (Sanskrit + English inline)
kṛṣṇa-janma-yātrā-dine nanda-mahotsava gopa-veśa hailā prabhu lañā bhakta saba
The devotees celebrated the festival of Janmāṣṭamī, Kṛṣṇa’s birthday, which is also called Nanda-mahotsava, the festival of Nanda Mahārāja. At that time Śrī Caitanya Mahāprabhu and His devotees dressed themselves as cowherd boys.
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Source: vedabase.io